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Silver110

Member Since: 10 Jun 2020
Location: East Sussex
Posts: 49

2008 Defender 110 Puma 2.4 XS CSW Zermatt Silver

Oil in engine bay and bonnet

Hi all,

Just had a trip up to Lake District and back from the south coast. About 50 miles from home started to hear a slight metallic noise every now and then apart from that no issues.

Got home abs opened the bonnet to find the below. Does anyone have any ideas on what they think this could be?

TIA

Click image to enlarge

Click image to enlarge

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22nd Jun 2021 2:34pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5739

2006 Defender 110 Td5 USW Zermatt Silver

Vacuum pump failed. Think it’s a known issue although thought they had all failed by now.

22nd Jun 2021 2:56pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5739

https://www.defender2.net/forum/topic64711...acuum+pump
https://www.defender2.net/forum/topic51106.html

22nd Jun 2021 3:01pm

Angus_Beef

Member Since: 30 Apr 2015
Location: Oslo
Posts: 434

2015 Defender 110 Puma 2.2 SW Corris Grey

landy andy wrote:
… thought they had all failed by now.

Roaming around 🇳🇴🇨🇭

22nd Jun 2021 3:22pm

hank

Member Since: 12 Sep 2016
Location: South Wales
Posts: 2303

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Having recently replaced my brake servo vacuum hose I came to realise that the sole purpose of the vacuum pump is provision of vacuum for the brake servo...

What I don't understand is why the vacuum pump is required at all? Why does the servo not take vacuum from the engine inlet like conventional vehicles? Of course after after the turbo the system is under pressure, but could vacuum not be drawn pre turbo?

Obviously the answer is no else there would be no requirement for a vacuum pump! Just curious for my own understanding

> 110 XS Double Cab

22nd Jun 2021 4:33pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3431

2012 Defender 90 Puma 2.2 CSW Santorini Black

For petrol engines yes, because petrol need to control the air to maintain the air/fuel ratio. Controlling air flow creates vacuum at inlet.
On a diesel, the air/fuel ratio is not important, and so there is no need to control air, and hence no vacuum at inlet (unless filter is seriously blocked). Having said that, modern diesels have something similar to petrol throttle body, but that is related to emissions control (and helps in smooth shutting down of the engine - no air, no compression). 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

22nd Jun 2021 4:54pm

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4218

2007 Defender 110 Puma 2.4 XS CSW Java Black

Diesels don't produce enough vaccim as they are unthrottled. Some more modern diesels do have a throttle, but I don't know if that does away with the need for a pump. 2007 110 TDCi Station Wagon XS

22nd Jun 2021 4:55pm

hank

Member Since: 12 Sep 2016
Location: South Wales
Posts: 2303

I see, thanks! > 110 XS Double Cab

23rd Jun 2021 10:19am

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